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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, € in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) office	Jun. 30, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction
Payment to acquire equity method investment	€ 2.5		$ 3,083	$ 0
Equity method investment ownership percentage	25.00%
Insertion order signed to advertise with TravelZoo | €	€ 1.5
Accounts payable		$ (14,251)	(14,251)			$ (19,105)
Decrease in deferred tax asset		(1,476)	(1,476)			$ (1,516)
Deferred revenue		966	966		$ 825
Deferred revenue, revenue recognized in period		$ 138	$ 585
Majority Shareholder
Related Party Transaction
Percent of outstanding shares held by related party		53.80%	53.80%
Minimum
Related Party Transaction
Number of offices | office			25
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Related Party Transaction
Accounts payable					1,600
Decrease in deferred tax asset					270
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Retained Earnings
Related Party Transaction
Cumulative adjustment					$ 1,300

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